it stats no more over healing i just tested it and was able to repeat it everytime.
The healing seems to be mostly on archers not on other units. Also on selling unicorns it cost more to buy a lvl 1 unicorn then to sell a lvl 5 unicorn this doesnt make since? like3 everything else.

We are looking into the health issue - guess it was something even more complicated. We`ll try again in the next patch

With Unicorns - and same with Ogres - had to do it, otherwise level 5 buildings could quickly and cheaply provide unicorns that could be soled for 3X profit, instead of 30% we want. Really minor annoyance though And check Uttal Ators - it`s a place to sell Unicorns for a profit.